raffinate

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raffinate

[′raf·ə‚nāt]
(chemical engineering)
In solvent refining, that portion of the treated liquid mixture that remains undissolved and is not removed by the selective solvent. Also known as good oil to petroleum-refinery operators.
References in periodicals archive ?
MSDW technology converts waxy oils and raffinates to conventional or ultra low pour point base oils and provides a significant increase in oil viscosity index.